pespin submitted this change.
modem: Initial integration of libosmo-gprs-{llc,sndcp}
Change-Id: I820328009ccdd1f8112aeb163efa064ec1465d2a
---
M src/host/layer23/include/osmocom/bb/common/logging.h
M src/host/layer23/include/osmocom/bb/common/settings.h
M src/host/layer23/include/osmocom/bb/modem/Makefile.am
A src/host/layer23/include/osmocom/bb/modem/llc.h
A src/host/layer23/include/osmocom/bb/modem/sndcp.h
M src/host/layer23/src/common/logging.c
M src/host/layer23/src/modem/Makefile.am
M src/host/layer23/src/modem/app_modem.c
A src/host/layer23/src/modem/llc.c
A src/host/layer23/src/modem/sndcp.c
10 files changed, 436 insertions(+), 1 deletion(-)
diff --git a/src/host/layer23/include/osmocom/bb/common/logging.h b/src/host/layer23/include/osmocom/bb/common/logging.h
index 5259f35..912b7d4 100644
--- a/src/host/layer23/include/osmocom/bb/common/logging.h
+++ b/src/host/layer23/include/osmocom/bb/common/logging.h
@@ -27,6 +27,8 @@
DLUA,
DGAPK,
DTUN,
+ DLLC,
+ DSNDCP,
};
extern const struct log_info log_info;
diff --git a/src/host/layer23/include/osmocom/bb/common/settings.h b/src/host/layer23/include/osmocom/bb/common/settings.h
index 523ad8e..5e04894 100644
--- a/src/host/layer23/include/osmocom/bb/common/settings.h
+++ b/src/host/layer23/include/osmocom/bb/common/settings.h
@@ -183,6 +183,22 @@
struct gprs_settings {
struct llist_head apn_list;
+
+ /* RFC1144 TCP/IP header compression */
+ struct {
+ int active;
+ int passive;
+ int s01;
+ } pcomp_rfc1144;
+
+ /* V.42vis data compression */
+ struct {
+ int active;
+ int passive;
+ int p0;
+ int p1;
+ int p2;
+ } dcomp_v42bis;
};
int gprs_settings_init(struct osmocom_ms *ms);
diff --git a/src/host/layer23/include/osmocom/bb/modem/Makefile.am b/src/host/layer23/include/osmocom/bb/modem/Makefile.am
index 309a514..4a91c39 100644
--- a/src/host/layer23/include/osmocom/bb/modem/Makefile.am
+++ b/src/host/layer23/include/osmocom/bb/modem/Makefile.am
@@ -1,4 +1,6 @@
noinst_HEADERS = \
modem.h \
+ llc.h \
+ sndcp.h \
vty.h \
$(NULL)
diff --git a/src/host/layer23/include/osmocom/bb/modem/llc.h b/src/host/layer23/include/osmocom/bb/modem/llc.h
new file mode 100644
index 0000000..5fe5d49
--- /dev/null
+++ b/src/host/layer23/include/osmocom/bb/modem/llc.h
@@ -0,0 +1,8 @@
+#pragma once
+
+#include <stdbool.h>
+
+struct osmocom_ms;
+
+int modem_llc_init(struct osmocom_ms *ms, const char *cipher_plugin_path);
+
diff --git a/src/host/layer23/include/osmocom/bb/modem/sndcp.h b/src/host/layer23/include/osmocom/bb/modem/sndcp.h
new file mode 100644
index 0000000..b2e6f0f
--- /dev/null
+++ b/src/host/layer23/include/osmocom/bb/modem/sndcp.h
@@ -0,0 +1,10 @@
+#pragma once
+
+#include <stdbool.h>
+
+struct osmocom_ms;
+struct osmobb_apn;
+
+int modem_sndcp_init(struct osmocom_ms *ms);
+int modem_sndcp_sn_xid_req(struct osmobb_apn *apn);
+int modem_sndcp_sn_unitdata_req(struct osmobb_apn *apn, uint8_t *npdu, size_t npdu_len);
diff --git a/src/host/layer23/src/common/logging.c b/src/host/layer23/src/common/logging.c
index 34c171f..66dc416 100644
--- a/src/host/layer23/src/common/logging.c
+++ b/src/host/layer23/src/common/logging.c
@@ -153,6 +153,18 @@
.color = "\033[0;37m",
.enabled = 1, .loglevel = LOGL_NOTICE,
},
+ [DLLC] = {
+ .name = "DLLC",
+ .description = "GPRS Logical Link Control Protocol (LLC)",
+ .color = "\033[0;38m",
+ .enabled = 1, .loglevel = LOGL_NOTICE,
+ },
+ [DSNDCP] = {
+ .name = "DSNDCP",
+ .description = "GPRS Sub-Network Dependent Control Protocol (SNDCP)",
+ .color = "\033[0;39m",
+ .enabled = 1, .loglevel = LOGL_NOTICE,
+ },
};
const struct log_info log_info = {
diff --git a/src/host/layer23/src/modem/Makefile.am b/src/host/layer23/src/modem/Makefile.am
index 4f369ad..e13ea2d 100644
--- a/src/host/layer23/src/modem/Makefile.am
+++ b/src/host/layer23/src/modem/Makefile.am
@@ -18,6 +18,8 @@
modem_SOURCES = \
$(top_srcdir)/src/common/main.c \
app_modem.c \
+ llc.c \
+ sndcp.c \
vty.c \
$(NULL)
modem_LDADD = \
diff --git a/src/host/layer23/src/modem/app_modem.c b/src/host/layer23/src/modem/app_modem.c
index 6b8466d..1be2cbc 100644
--- a/src/host/layer23/src/modem/app_modem.c
+++ b/src/host/layer23/src/modem/app_modem.c
@@ -48,6 +48,8 @@
#include <osmocom/bb/common/l1l2_interface.h>
#include <osmocom/bb/common/sysinfo.h>
#include <osmocom/bb/common/apn.h>
+#include <osmocom/bb/modem/llc.h>
+#include <osmocom/bb/modem/sndcp.h>
#include <osmocom/bb/modem/vty.h>
#include <l1ctl_proto.h>
@@ -105,7 +107,7 @@
LOGPAPN(LOGL_DEBUG, apn, "system wants to transmit IPv%c pkt to %s (%zu bytes)\n",
iph->version == 4 ? '4' : '6', osmo_sockaddr_ntop(&dst.u.sa, addrstr), pkt_len);
- /* TODO: prepare & transmit SNDCP UNITDATA.req */
+ rc = modem_sndcp_sn_unitdata_req(apn, msgb_data(msg), pkt_len);
free_ret:
msgb_free(msg);
@@ -539,6 +541,8 @@
int l23_app_init(void)
{
+ int rc;
+
l23_app_start = _modem_start;
log_set_category_filter(osmo_stderr_target, DLGLOBAL, 1, LOGL_DEBUG);
@@ -548,6 +552,16 @@
app_data.ms = osmocom_ms_alloc(l23_ctx, "1");
OSMO_ASSERT(app_data.ms);
+ if ((rc = modem_llc_init(app_data.ms, NULL))) {
+ LOGP(DLLC, LOGL_FATAL, "Failed initializing LLC layer\n");
+ return rc;
+ }
+
+ if ((rc = modem_sndcp_init(app_data.ms))) {
+ LOGP(DSNDCP, LOGL_FATAL, "Failed initializing SNDCP layer\n");
+ return rc;
+ }
+
osmo_signal_register_handler(SS_L1CTL, &signal_cb, NULL);
lapdm_channel_set_l3(&app_data.ms->lapdm_channel, &modem_rslms_cb, app_data.ms);
return 0;
diff --git a/src/host/layer23/src/modem/llc.c b/src/host/layer23/src/modem/llc.c
new file mode 100644
index 0000000..196c240
--- /dev/null
+++ b/src/host/layer23/src/modem/llc.c
@@ -0,0 +1,168 @@
+/* GPRS LLC protocol implementation as per 3GPP TS 04.64 */
+/* (C) 2023 by sysmocom - s.m.f.c. GmbH <info@sysmocom.de>
+ * All Rights Reserved
+ * Author: Pau Espin Pedrol <pespin@sysmocom.de>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/lienses/>.
+ *
+ */
+
+#include <errno.h>
+#include <stdint.h>
+#include <stdbool.h>
+#include <inttypes.h>
+
+#include <osmocom/core/msgb.h>
+#include <osmocom/core/linuxlist.h>
+#include <osmocom/core/timer.h>
+#include <osmocom/core/talloc.h>
+#include <osmocom/core/rate_ctr.h>
+#include <osmocom/crypt/kdf.h>
+#include <osmocom/gprs/gprs_bssgp.h>
+#include <osmocom/gsm/gsm_utils.h>
+#include <osmocom/gprs/llc/llc_prim.h>
+#include <osmocom/gprs/llc/llc.h>
+#include <osmocom/gprs/sndcp/sndcp_prim.h>
+
+#include <osmocom/bb/common/logging.h>
+#include <osmocom/bb/common/apn.h>
+#include <osmocom/bb/common/ms.h>
+#include <osmocom/bb/modem/llc.h>
+
+static int modem_llc_handle_ll_gmm(struct osmo_gprs_llc_prim *llc_prim)
+{
+ struct msgb *msg;
+
+ switch (llc_prim->oph.primitive) {
+ case OSMO_GPRS_LLC_LL_UNITDATA:
+ break;
+ case OSMO_GPRS_LLC_LL_RESET:
+ case OSMO_GPRS_LLC_LL_ESTABLISH:
+ case OSMO_GPRS_LLC_LL_XID:
+ case OSMO_GPRS_LLC_LL_DATA:
+ case OSMO_GPRS_LLC_LL_STATUS:
+ default:
+ LOGP(DLLC, LOGL_NOTICE, "%s(): Unexpected Rx LL prim %u\n",
+ __func__, llc_prim->oph.primitive);
+ return -EINVAL;
+ }
+
+ msg = msgb_alloc(4096, "gsm0408_rx");
+ msgb_tlli(msg) = llc_prim->ll.tlli;
+ msgb_gmmh(msg) = msgb_put(msg, llc_prim->ll.l3_pdu_len);
+ if (llc_prim->ll.l3_pdu_len > 0)
+ memcpy(msgb_gmmh(msg), llc_prim->ll.l3_pdu, llc_prim->ll.l3_pdu_len);
+
+ //TODO: submit to GMM?
+ //TODO: free msg?
+ return 0;
+}
+
+static int modem_llc_handle_ll_sndcp(struct osmo_gprs_llc_prim *llc_prim)
+{
+ int rc;
+ switch (llc_prim->oph.primitive) {
+ case OSMO_GPRS_LLC_LL_RESET:
+ case OSMO_GPRS_LLC_LL_ESTABLISH:
+ case OSMO_GPRS_LLC_LL_XID:
+ case OSMO_GPRS_LLC_LL_DATA:
+ case OSMO_GPRS_LLC_LL_UNITDATA:
+ case OSMO_GPRS_LLC_LL_STATUS:
+ /* Forward it to upper layers, pass owneserip over to SNDCP: */
+ osmo_gprs_sndcp_prim_lower_up(llc_prim);
+ rc = 1; /* Tell LLC that we take ownership of the prim. */
+ break;
+ default:
+ LOGP(DLLC, LOGL_NOTICE, "%s(): Unexpected Rx LL prim %u\n",
+ __func__, llc_prim->oph.primitive);
+ rc = -EINVAL;
+ }
+ return rc;
+}
+
+int modem_llc_prim_up_cb(struct osmo_gprs_llc_prim *llc_prim, void *user_data)
+{
+ const char *pdu_name = osmo_gprs_llc_prim_name(llc_prim);
+ int rc = 0;
+
+ switch (llc_prim->oph.sap) {
+ case OSMO_GPRS_LLC_SAP_LLGM:
+ LOGP(DLLC, LOGL_DEBUG, "%s(): Rx %s TLLI=0x%08x\n",
+ __func__, pdu_name, llc_prim->llgmm.tlli);
+ break;
+ case OSMO_GPRS_LLC_SAP_LL:
+ LOGP(DLLC, LOGL_DEBUG, "%s(): Rx %s TLLI=0x%08x SAPI=%s l3=[%s]\n",
+ __func__, pdu_name, llc_prim->ll.tlli,
+ osmo_gprs_llc_sapi_name(llc_prim->ll.sapi),
+ osmo_hexdump(llc_prim->ll.l3_pdu, llc_prim->ll.l3_pdu_len));
+
+ switch (llc_prim->ll.sapi) {
+ case OSMO_GPRS_LLC_SAPI_GMM:
+ rc = modem_llc_handle_ll_gmm(llc_prim);
+ break;
+ case OSMO_GPRS_LLC_SAPI_SNDCP3:
+ case OSMO_GPRS_LLC_SAPI_SNDCP5:
+ case OSMO_GPRS_LLC_SAPI_SNDCP9:
+ case OSMO_GPRS_LLC_SAPI_SNDCP11:
+ rc = modem_llc_handle_ll_sndcp(llc_prim);
+ break;
+ case OSMO_GPRS_LLC_SAPI_TOM2:
+ case OSMO_GPRS_LLC_SAPI_SMS:
+ case OSMO_GPRS_LLC_SAPI_TOM8:
+ LOGP(DLLC, LOGL_NOTICE, "%s(): Unimplemented Rx llc_sapi %s\n", __func__, pdu_name);
+ rc = -EINVAL;
+ break;
+ default:
+ LOGP(DLLC, LOGL_NOTICE, "%s(): Unexpected Rx llc_sapi %s\n", __func__, pdu_name);
+ rc = -EINVAL;
+ break;
+ }
+ break;
+ default:
+ LOGP(DLLC, LOGL_NOTICE, "%s(): Unexpected Rx %s\n", __func__, pdu_name);
+ OSMO_ASSERT(0);
+ }
+ return rc;
+}
+
+int modem_llc_prim_down_cb(struct osmo_gprs_llc_prim *llc_prim, void *user_data)
+{
+ const char *pdu_name = osmo_gprs_llc_prim_name(llc_prim);
+ int rc = 0;
+
+ switch (llc_prim->oph.sap) {
+ case OSMO_GPRS_LLC_SAP_GRR:
+ LOGP(DLLC, LOGL_DEBUG, "%s(): Rx %s l3=[%s]\n", __func__, pdu_name,
+ osmo_hexdump(llc_prim->grr.ll_pdu, llc_prim->grr.ll_pdu_len));
+ break;
+ default:
+ LOGP(DLLC, LOGL_DEBUG, "%s(): Unexpected Rx %s\n", __func__, pdu_name);
+ OSMO_ASSERT(0);
+ }
+ return rc;
+}
+
+int modem_llc_init(struct osmocom_ms *ms, const char *cipher_plugin_path)
+{
+ int rc;
+ rc = osmo_gprs_llc_init(OSMO_GPRS_LLC_LOCATION_MS, cipher_plugin_path);
+ if (rc != 0)
+ return rc;
+
+ osmo_gprs_llc_set_log_cat(OSMO_GPRS_LLC_LOGC_LLC, DLLC);
+
+ osmo_gprs_llc_prim_set_up_cb(modem_llc_prim_up_cb, ms);
+ osmo_gprs_llc_prim_set_down_cb(modem_llc_prim_down_cb, ms);
+ return rc;
+}
diff --git a/src/host/layer23/src/modem/sndcp.c b/src/host/layer23/src/modem/sndcp.c
new file mode 100644
index 0000000..eba8d11
--- /dev/null
+++ b/src/host/layer23/src/modem/sndcp.c
@@ -0,0 +1,201 @@
+/* GPRS SNDCP User/SN/SNSM interfaces as per 3GPP TS 04.65 */
+/* (C) 2023 by sysmocom - s.m.f.c. GmbH <info@sysmocom.de>
+ * All Rights Reserved
+ * Author: Pau Espin Pedrol <pespin@sysmocom.de>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/lienses/>.
+ *
+ */
+
+#include <stdbool.h>
+#include <stdint.h>
+#include <errno.h>
+#include <stdio.h>
+
+#include <netinet/ip.h>
+#include <netinet/ip6.h>
+
+#include <osmocom/core/msgb.h>
+#include <osmocom/core/linuxlist.h>
+#include <osmocom/core/timer.h>
+#include <osmocom/core/talloc.h>
+#include <osmocom/core/endian.h>
+#include <osmocom/core/tun.h>
+
+#include <osmocom/gprs/llc/llc.h>
+#include <osmocom/gprs/llc/llc_prim.h>
+#include <osmocom/gprs/sndcp/sndcp_prim.h>
+#include <osmocom/gprs/sndcp/sndcp.h>
+
+#include <osmocom/bb/common/logging.h>
+#include <osmocom/bb/common/apn.h>
+#include <osmocom/bb/common/ms.h>
+#include <osmocom/bb/modem/sndcp.h>
+
+/* Received SN-XID.cnf from SNDCP layer: */
+static int modem_sndcp_handle_sn_xid_cnf(struct osmobb_apn *apn, struct osmo_gprs_sndcp_prim *sndcp_prim)
+{
+ LOGP(DSNDCP, LOGL_ERROR, "%s(): Rx SN-XID.cnf: TODO IMPLEMENT!\n", __func__);
+ return 0;
+}
+
+/* Received SN-UNITDTA.ind from SNDCP layer: */
+static int modem_sndcp_handle_sn_unitdata_ind(struct osmobb_apn *apn, struct osmo_gprs_sndcp_prim *sndcp_prim)
+{
+ const char *npdu_name = osmo_gprs_sndcp_prim_name(sndcp_prim);
+ struct msgb *msg;
+ int rc;
+
+ LOGP(DSNDCP, LOGL_DEBUG, "Rx %s TLLI=0x%08x SAPI=%s NSAPI=%u NPDU=[%s]\n",
+ npdu_name,
+ sndcp_prim->sn.tlli, osmo_gprs_llc_sapi_name(sndcp_prim->sn.sapi),
+ sndcp_prim->sn.data_req.nsapi,
+ osmo_hexdump(sndcp_prim->sn.data_ind.npdu, sndcp_prim->sn.data_ind.npdu_len));
+
+ msg = msgb_alloc(sndcp_prim->sn.data_ind.npdu_len, "tx_tun");
+ memcpy(msgb_put(msg, sndcp_prim->sn.data_ind.npdu_len),
+ sndcp_prim->sn.data_ind.npdu,
+ sndcp_prim->sn.data_ind.npdu_len);
+ rc = osmo_tundev_send(apn->tun, msg);
+ return rc;
+}
+
+static int modem_sndcp_prim_up_cb(struct osmo_gprs_sndcp_prim *sndcp_prim, void *user_data)
+{
+ struct osmocom_ms *ms = user_data;
+ struct osmobb_apn *apn;
+ const char *npdu_name = osmo_gprs_sndcp_prim_name(sndcp_prim);
+ int rc = 0;
+
+ if (sndcp_prim->oph.sap != OSMO_GPRS_SNDCP_SAP_SN) {
+ LOGP(DSNDCP, LOGL_ERROR, "%s(): Unexpected Rx %s\n", __func__, npdu_name);
+ OSMO_ASSERT(0);
+ }
+
+ /* TODO: properly retrieve APN/PDP based on TLLI/SAPI/NSAPI: */
+ apn = llist_first_entry_or_null(&ms->gprs.apn_list, struct osmobb_apn, list);
+ if (!apn) {
+ LOGP(DSNDCP, LOGL_NOTICE, "Unable to find destination APN: Rx %s\n", npdu_name);
+ return -ENODEV;
+ }
+
+ switch (OSMO_PRIM_HDR(&sndcp_prim->oph)) {
+ case OSMO_PRIM(OSMO_GPRS_SNDCP_SN_UNITDATA, PRIM_OP_INDICATION):
+ rc = modem_sndcp_handle_sn_unitdata_ind(apn, sndcp_prim);
+ break;
+ case OSMO_PRIM(OSMO_GPRS_SNDCP_SN_XID, PRIM_OP_CONFIRM):
+ rc = modem_sndcp_handle_sn_xid_cnf(apn, sndcp_prim);
+ break;
+ default:
+ LOGP(DSNDCP, LOGL_ERROR, "%s(): Rx %s UNIMPLEMENTED\n", __func__, npdu_name);
+ break;
+ };
+ return rc;
+}
+
+static int modem_sndcp_prim_down_cb(struct osmo_gprs_llc_prim *llc_prim, void *user_data)
+{
+ const char *pdu_name = osmo_gprs_llc_prim_name(llc_prim);
+ int rc = 0;
+
+ if (llc_prim->oph.sap != OSMO_GPRS_LLC_SAP_LL) {
+ LOGP(DSNDCP, LOGL_ERROR, "%s(): Unexpected Rx %s\n", __func__, pdu_name);
+ OSMO_ASSERT(0);
+ }
+
+ switch (OSMO_PRIM_HDR(&llc_prim->oph)) {
+ case OSMO_PRIM(OSMO_GPRS_LLC_LL_UNITDATA, PRIM_OP_REQUEST):
+ LOGP(DSNDCP, LOGL_DEBUG, "%s(): Rx %s TLLI=0x%08x SAPI=%s L3=[%s]\n",
+ __func__, pdu_name,
+ llc_prim->ll.tlli, osmo_gprs_llc_sapi_name(llc_prim->ll.sapi),
+ osmo_hexdump(llc_prim->ll.l3_pdu, llc_prim->ll.l3_pdu_len));
+ rc = osmo_gprs_llc_prim_upper_down(llc_prim);
+ rc = 1; /* Tell SNDCP layer we took msgb ownsership and transfer it to LLC */
+ break;
+ default:
+ LOGP(DSNDCP, LOGL_ERROR, "%s(): Rx %s UNIMPLEMENTED\n", __func__, pdu_name);
+ break;
+ };
+ return rc;
+}
+
+static int modem_sndcp_prim_snsm_cb(struct osmo_gprs_sndcp_prim *sndcp_prim, void *user_data)
+{
+ const char *npdu_name = osmo_gprs_sndcp_prim_name(sndcp_prim);
+
+ if (sndcp_prim->oph.sap != OSMO_GPRS_SNDCP_SAP_SNSM) {
+ LOGP(DSNDCP, LOGL_ERROR, "%s(): Unexpected Rx %s\n", __func__, npdu_name);
+ OSMO_ASSERT(0);
+ }
+
+ LOGP(DSNDCP, LOGL_ERROR, "%s(): Rx %s UNIMPLEMENTED\n", __func__, npdu_name);
+ return 0;
+}
+
+
+int modem_sndcp_init(struct osmocom_ms *ms)
+{
+ int rc;
+ rc = osmo_gprs_sndcp_init();
+ if (rc != 0)
+ return rc;
+
+ osmo_gprs_sndcp_set_log_cat(OSMO_GPRS_SNDCP_LOGC_SNDCP, DSNDCP);
+ osmo_gprs_sndcp_set_log_cat(OSMO_GPRS_SNDCP_LOGC_SLHC, DSNDCP);
+
+ osmo_gprs_sndcp_prim_set_up_cb(modem_sndcp_prim_up_cb, ms);
+ osmo_gprs_sndcp_prim_set_down_cb(modem_sndcp_prim_down_cb, ms);
+ osmo_gprs_sndcp_prim_set_snsm_cb(modem_sndcp_prim_snsm_cb, ms);
+ return rc;
+}
+
+int modem_sndcp_sn_xid_req(struct osmobb_apn *apn)
+{
+ struct osmo_gprs_sndcp_prim *sndcp_prim;
+ int rc;
+ struct osmocom_ms *ms = apn->ms;
+ struct gprs_settings *set = &ms->gprs;
+
+ /* TODO: look up PDP context IDs from ms once we have GMM layer. */
+ uint32_t tlli = 0xe1c5d364;
+ uint8_t sapi = OSMO_GPRS_LLC_SAPI_SNDCP3;
+ uint8_t nsapi = 1;
+
+ sndcp_prim = osmo_gprs_sndcp_prim_alloc_sn_xid_req(tlli, sapi, nsapi);
+ OSMO_ASSERT(sndcp_prim);
+ sndcp_prim->sn.xid_req.pcomp_rfc1144.active = set->pcomp_rfc1144.active;
+ sndcp_prim->sn.xid_req.pcomp_rfc1144.s01 = set->pcomp_rfc1144.s01;
+ sndcp_prim->sn.xid_req.dcomp_v42bis.active = set->dcomp_v42bis.active;
+ sndcp_prim->sn.xid_req.dcomp_v42bis.p0 = set->dcomp_v42bis.p0;
+ sndcp_prim->sn.xid_req.dcomp_v42bis.p1 = set->dcomp_v42bis.p1;
+ sndcp_prim->sn.xid_req.dcomp_v42bis.p2 = set->dcomp_v42bis.p2;
+ rc = osmo_gprs_sndcp_prim_upper_down(sndcp_prim);
+ return rc;
+}
+
+int modem_sndcp_sn_unitdata_req(struct osmobb_apn *apn, uint8_t *npdu, size_t npdu_len)
+{
+ struct osmo_gprs_sndcp_prim *sndcp_prim;
+ int rc;
+
+ /* TODO: look up PDP context IDs from apn->ms once we have GMM layer. */
+ uint32_t tlli = 0xe1c5d364;
+ uint8_t sapi = OSMO_GPRS_LLC_SAPI_SNDCP3;
+ uint8_t nsapi = 1;
+
+ sndcp_prim = osmo_gprs_sndcp_prim_alloc_sn_unitdata_req(tlli, sapi, nsapi, npdu, npdu_len);
+ OSMO_ASSERT(sndcp_prim);
+ rc = osmo_gprs_sndcp_prim_upper_down(sndcp_prim);
+ return rc;
+}
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